Allow issue relation autocomplete to select multiple values (#33418).

Patch by Marius BALTEANU.


git-svn-id: http://svn.redmine.org/redmine/trunk@20690 e93f8b46-1217-0410-a6f0-8f06a7374b81

public/javascripts/application.js

@@ -617,6 +617,46 @@ function observeAutocompleteField(fieldId, url, options) {
   });
 }
 
+function multipleAutocompleteField(fieldId, url, options) {
+  function split(val) {
+    return val.split(/,\s*/);
+  }
+
+  function extractLast(term) {
+    return split(term).pop();
+  }
+
+  $(document).ready(function () {
+    $('#' + fieldId).autocomplete($.extend({
+      source: function (request, response) {
+        $.getJSON(url, {
+          term: extractLast(request.term)
+        }, response);
+      },
+      minLength: 2,
+      position: {collision: "flipfit"},
+      search: function () {
+        $('#' + fieldId).addClass('ajax-loading');
+      },
+      response: function () {
+        $('#' + fieldId).removeClass('ajax-loading');
+      },
+      select: function (event, ui) {
+        var terms = split(this.value);
+        // remove the current input
+        terms.pop();
+        // add the selected item
+        terms.push(ui.item.value);
+        // add placeholder to get the comma-and-space at the end
+        terms.push("");
+        this.value = terms.join(", ");
+        return false;
+      }
+    }, options));
+    $('#' + fieldId).addClass('autocomplete');
+  });
+}
+
 function observeSearchfield(fieldId, targetId, url) {
   $('#'+fieldId).each(function() {
     var $this = $(this);